Our brains have a negativity bias and will remember bad memories more than good ones.
15
Every human spent about half an hour as a single cell.
144
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
Humans are capable of running 40 mph according to a study by bio-mechanical expert Dr. Matthew Bundle. Today's fastest man, Usain Bolt, has a top speed of 28 mph.
35
Only humans shed emotional tears.
331
An average heart beats 100,000 times a day, pumping some 2,000 gallons of blood through its chambers. Over a 70-year life span, that adds up to more than 2.5 billion heartbeats.
73